sys/netinet/ip_output.c

   1 /*-
   2  * Copyright (c) 1982, 1986, 1988, 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)ip_output.c 8.3 (Berkeley) 1/21/94
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __FBSDID("$FreeBSD$");
  34
  35 #include "opt_inet.h"
  36 #include "opt_ipsec.h"
  37 #include "opt_mbuf_stress_test.h"
  38 #include "opt_mpath.h"
  39 #include "opt_route.h"
  40 #include "opt_sctp.h"
  41 #include "opt_rss.h"
  42
  43 #include <sys/param.h>
  44 #include <sys/systm.h>
  45 #include <sys/kernel.h>
  46 #include <sys/lock.h>
  47 #include <sys/malloc.h>
  48 #include <sys/mbuf.h>
  49 #include <sys/priv.h>
  50 #include <sys/proc.h>
  51 #include <sys/protosw.h>
  52 #include <sys/rmlock.h>
  53 #include <sys/sdt.h>
  54 #include <sys/socket.h>
  55 #include <sys/socketvar.h>
  56 #include <sys/sysctl.h>
  57 #include <sys/ucred.h>
  58
  59 #include <net/if.h>
  60 #include <net/if_var.h>
  61 #include <net/if_llatbl.h>
  62 #include <net/netisr.h>
  63 #include <net/pfil.h>
  64 #include <net/route.h>
  65 #include <net/flowtable.h>
  66 #ifdef RADIX_MPATH
  67 #include <net/radix_mpath.h>
  68 #endif
  69 #include <net/rss_config.h>
  70 #include <net/vnet.h>
  71
  72 #include <netinet/in.h>
  73 #include <netinet/in_kdtrace.h>
  74 #include <netinet/in_systm.h>
  75 #include <netinet/ip.h>
  76 #include <netinet/in_pcb.h>
  77 #include <netinet/in_rss.h>
  78 #include <netinet/in_var.h>
  79 #include <netinet/ip_var.h>
  80 #include <netinet/ip_options.h>
  81 #ifdef SCTP
  82 #include <netinet/sctp.h>
  83 #include <netinet/sctp_crc32.h>
  84 #endif
  85
  86 #include <netipsec/ipsec_support.h>
  87
  88 #include <machine/in_cksum.h>
  89
  90 #include <security/mac/mac_framework.h>
  91
  92 #ifdef MBUF_STRESS_TEST
  93 static int mbuf_frag_size = 0;
  94 SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW,
  95         &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size");
  96 #endif
  97
  98 static void     ip_mloopback(struct ifnet *, const struct mbuf *, int);
  99
 100
 101 extern int in_mcast_loop;
 102 extern  struct protosw inetsw[];
 103
 104 static inline int
 105 ip_output_pfil(struct mbuf **mp, struct ifnet *ifp, struct inpcb *inp,
 106     struct sockaddr_in *dst, int *fibnum, int *error)
 107 {
 108         struct m_tag *fwd_tag = NULL;
 109         struct mbuf *m;
 110         struct in_addr odst;
 111         struct ip *ip;
 112
 113         m = *mp;
 114         ip = mtod(m, struct ip *);
 115
 116         /* Run through list of hooks for output packets. */
 117         odst.s_addr = ip->ip_dst.s_addr;
 118         *error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, PFIL_OUT, 0, inp);
 119         m = *mp;
 120         if ((*error) != 0 || m == NULL)
 121                 return 1; /* Finished */
 122
 123         ip = mtod(m, struct ip *);
 124
 125         /* See if destination IP address was changed by packet filter. */
 126         if (odst.s_addr != ip->ip_dst.s_addr) {
 127                 m->m_flags |= M_SKIP_FIREWALL;
 128                 /* If destination is now ourself drop to ip_input(). */
 129                 if (in_localip(ip->ip_dst)) {
 130                         m->m_flags |= M_FASTFWD_OURS;
 131                         if (m->m_pkthdr.rcvif == NULL)
 132                                 m->m_pkthdr.rcvif = V_loif;
 133                         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
 134                                 m->m_pkthdr.csum_flags |=
 135                                         CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
 136                                 m->m_pkthdr.csum_data = 0xffff;
 137                         }
 138                         m->m_pkthdr.csum_flags |=
 139                                 CSUM_IP_CHECKED | CSUM_IP_VALID;
 140 #ifdef SCTP
 141                         if (m->m_pkthdr.csum_flags & CSUM_SCTP)
 142                                 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
 143 #endif
 144                         *error = netisr_queue(NETISR_IP, m);
 145                         return 1; /* Finished */
 146                 }
 147
 148                 bzero(dst, sizeof(*dst));
 149                 dst->sin_family = AF_INET;
 150                 dst->sin_len = sizeof(*dst);
 151                 dst->sin_addr = ip->ip_dst;
 152
 153                 return -1; /* Reloop */
 154         }
 155         /* See if fib was changed by packet filter. */
 156         if ((*fibnum) != M_GETFIB(m)) {
 157                 m->m_flags |= M_SKIP_FIREWALL;
 158                 *fibnum = M_GETFIB(m);
 159                 return -1; /* Reloop for FIB change */
 160         }
 161
 162         /* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */
 163         if (m->m_flags & M_FASTFWD_OURS) {
 164                 if (m->m_pkthdr.rcvif == NULL)
 165                         m->m_pkthdr.rcvif = V_loif;
 166                 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
 167                         m->m_pkthdr.csum_flags |=
 168                                 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
 169                         m->m_pkthdr.csum_data = 0xffff;
 170                 }
 171 #ifdef SCTP
 172                 if (m->m_pkthdr.csum_flags & CSUM_SCTP)
 173                         m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
 174 #endif
 175                 m->m_pkthdr.csum_flags |=
 176                         CSUM_IP_CHECKED | CSUM_IP_VALID;
 177
 178                 *error = netisr_queue(NETISR_IP, m);
 179                 return 1; /* Finished */
 180         }
 181         /* Or forward to some other address? */
 182         if ((m->m_flags & M_IP_NEXTHOP) &&
 183             ((fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL)) {
 184                 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in));
 185                 m->m_flags |= M_SKIP_FIREWALL;
 186                 m->m_flags &= ~M_IP_NEXTHOP;
 187                 m_tag_delete(m, fwd_tag);
 188
 189                 return -1; /* Reloop for CHANGE of dst */
 190         }
 191
 192         return 0;
 193 }
 194
 195 /*
 196  * IP output.  The packet in mbuf chain m contains a skeletal IP
 197  * header (with len, off, ttl, proto, tos, src, dst).
 198  * The mbuf chain containing the packet will be freed.
 199  * The mbuf opt, if present, will not be freed.
 200  * If route ro is present and has ro_rt initialized, route lookup would be
 201  * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL,
 202  * then result of route lookup is stored in ro->ro_rt.
 203  *
 204  * In the IP forwarding case, the packet will arrive with options already
 205  * inserted, so must have a NULL opt pointer.
 206  */
 207 int
 208 ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags,
 209     struct ip_moptions *imo, struct inpcb *inp)
 210 {
 211         struct rm_priotracker in_ifa_tracker;
 212         struct ip *ip;
 213         struct ifnet *ifp = NULL;       /* keep compiler happy */
 214         struct mbuf *m0;
 215         int hlen = sizeof (struct ip);
 216         int mtu;
 217         int error = 0;
 218         struct sockaddr_in *dst;
 219         const struct sockaddr_in *gw;
 220         struct in_ifaddr *ia;
 221         int isbroadcast;
 222         uint16_t ip_len, ip_off;
 223         struct route iproute;
 224         struct rtentry *rte;    /* cache for ro->ro_rt */
 225         uint32_t fibnum;
 226         int have_ia_ref;
 227 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 228         int no_route_but_check_spd = 0;
 229 #endif
 230         M_ASSERTPKTHDR(m);
 231
 232         if (inp != NULL) {
 233                 INP_LOCK_ASSERT(inp);
 234                 M_SETFIB(m, inp->inp_inc.inc_fibnum);
 235                 if ((flags & IP_NODEFAULTFLOWID) == 0) {
 236                         m->m_pkthdr.flowid = inp->inp_flowid;
 237                         M_HASHTYPE_SET(m, inp->inp_flowtype);
 238                 }
 239         }
 240
 241         if (ro == NULL) {
 242                 ro = &iproute;
 243                 bzero(ro, sizeof (*ro));
 244         }
 245
 246 #ifdef FLOWTABLE
 247         if (ro->ro_rt == NULL)
 248                 (void )flowtable_lookup(AF_INET, m, ro);
 249 #endif
 250
 251         if (opt) {
 252                 int len = 0;
 253                 m = ip_insertoptions(m, opt, &len);
 254                 if (len != 0)
 255                         hlen = len; /* ip->ip_hl is updated above */
 256         }
 257         ip = mtod(m, struct ip *);
 258         ip_len = ntohs(ip->ip_len);
 259         ip_off = ntohs(ip->ip_off);
 260
 261         if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
 262                 ip->ip_v = IPVERSION;
 263                 ip->ip_hl = hlen >> 2;
 264                 ip_fillid(ip);
 265         } else {
 266                 /* Header already set, fetch hlen from there */
 267                 hlen = ip->ip_hl << 2;
 268         }
 269         if ((flags & IP_FORWARDING) == 0)
 270                 IPSTAT_INC(ips_localout);
 271
 272         /*
 273          * dst/gw handling:
 274          *
 275          * dst can be rewritten but always points to &ro->ro_dst.
 276          * gw is readonly but can point either to dst OR rt_gateway,
 277          * therefore we need restore gw if we're redoing lookup.
 278          */
 279         gw = dst = (struct sockaddr_in *)&ro->ro_dst;
 280         fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m);
 281         rte = ro->ro_rt;
 282         if (rte == NULL) {
 283                 bzero(dst, sizeof(*dst));
 284                 dst->sin_family = AF_INET;
 285                 dst->sin_len = sizeof(*dst);
 286                 dst->sin_addr = ip->ip_dst;
 287         }
 288 again:
 289         /*
 290          * Validate route against routing table additions;
 291          * a better/more specific route might have been added.
 292          */
 293         if (inp)
 294                 RT_VALIDATE(ro, &inp->inp_rt_cookie, fibnum);
 295         /*
 296          * If there is a cached route,
 297          * check that it is to the same destination
 298          * and is still up.  If not, free it and try again.
 299          * The address family should also be checked in case of sharing the
 300          * cache with IPv6.
 301          * Also check whether routing cache needs invalidation.
 302          */
 303         rte = ro->ro_rt;
 304         if (rte && ((rte->rt_flags & RTF_UP) == 0 ||
 305                     rte->rt_ifp == NULL ||
 306                     !RT_LINK_IS_UP(rte->rt_ifp) ||
 307                           dst->sin_family != AF_INET ||
 308                           dst->sin_addr.s_addr != ip->ip_dst.s_addr)) {
 309                 RTFREE(rte);
 310                 rte = ro->ro_rt = (struct rtentry *)NULL;
 311                 if (ro->ro_lle)
 312                         LLE_FREE(ro->ro_lle);   /* zeros ro_lle */
 313                 ro->ro_lle = (struct llentry *)NULL;
 314         }
 315         ia = NULL;
 316         have_ia_ref = 0;
 317         /*
 318          * If routing to interface only, short circuit routing lookup.
 319          * The use of an all-ones broadcast address implies this; an
 320          * interface is specified by the broadcast address of an interface,
 321          * or the destination address of a ptp interface.
 322          */
 323         if (flags & IP_SENDONES) {
 324                 if ((ia = ifatoia(ifa_ifwithbroadaddr(sintosa(dst),
 325                                                       M_GETFIB(m)))) == NULL &&
 326                     (ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
 327                                                     M_GETFIB(m)))) == NULL) {
 328                         IPSTAT_INC(ips_noroute);
 329                         error = ENETUNREACH;
 330                         goto bad;
 331                 }
 332                 have_ia_ref = 1;
 333                 ip->ip_dst.s_addr = INADDR_BROADCAST;
 334                 dst->sin_addr = ip->ip_dst;
 335                 ifp = ia->ia_ifp;
 336                 ip->ip_ttl = 1;
 337                 isbroadcast = 1;
 338         } else if (flags & IP_ROUTETOIF) {
 339                 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
 340                                                     M_GETFIB(m)))) == NULL &&
 341                     (ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0,
 342                                                 M_GETFIB(m)))) == NULL) {
 343                         IPSTAT_INC(ips_noroute);
 344                         error = ENETUNREACH;
 345                         goto bad;
 346                 }
 347                 have_ia_ref = 1;
 348                 ifp = ia->ia_ifp;
 349                 ip->ip_ttl = 1;
 350                 isbroadcast = in_broadcast(dst->sin_addr, ifp);
 351         } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) &&
 352             imo != NULL && imo->imo_multicast_ifp != NULL) {
 353                 /*
 354                  * Bypass the normal routing lookup for multicast
 355                  * packets if the interface is specified.
 356                  */
 357                 ifp = imo->imo_multicast_ifp;
 358                 IFP_TO_IA(ifp, ia, &in_ifa_tracker);
 359                 if (ia)
 360                         have_ia_ref = 1;
 361                 isbroadcast = 0;        /* fool gcc */
 362         } else {
 363                 /*
 364                  * We want to do any cloning requested by the link layer,
 365                  * as this is probably required in all cases for correct
 366                  * operation (as it is for ARP).
 367                  */
 368                 if (rte == NULL) {
 369 #ifdef RADIX_MPATH
 370                         rtalloc_mpath_fib(ro,
 371                             ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr),
 372                             fibnum);
 373 #else
 374                         in_rtalloc_ign(ro, 0, fibnum);
 375 #endif
 376                         rte = ro->ro_rt;
 377                 }
 378                 if (rte == NULL ||
 379                     (rte->rt_flags & RTF_UP) == 0 ||
 380                     rte->rt_ifp == NULL ||
 381                     !RT_LINK_IS_UP(rte->rt_ifp)) {
 382 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 383                         /*
 384                          * There is no route for this packet, but it is
 385                          * possible that a matching SPD entry exists.
 386                          */
 387                         no_route_but_check_spd = 1;
 388                         mtu = 0; /* Silence GCC warning. */
 389                         goto sendit;
 390 #endif
 391                         IPSTAT_INC(ips_noroute);
 392                         error = EHOSTUNREACH;
 393                         goto bad;
 394                 }
 395                 ia = ifatoia(rte->rt_ifa);
 396                 ifp = rte->rt_ifp;
 397                 counter_u64_add(rte->rt_pksent, 1);
 398                 rt_update_ro_flags(ro);
 399                 if (rte->rt_flags & RTF_GATEWAY)
 400                         gw = (struct sockaddr_in *)rte->rt_gateway;
 401                 if (rte->rt_flags & RTF_HOST)
 402                         isbroadcast = (rte->rt_flags & RTF_BROADCAST);
 403                 else
 404                         isbroadcast = in_broadcast(gw->sin_addr, ifp);
 405         }
 406
 407         /*
 408          * Calculate MTU.  If we have a route that is up, use that,
 409          * otherwise use the interface's MTU.
 410          */
 411         if (rte != NULL && (rte->rt_flags & (RTF_UP|RTF_HOST)))
 412                 mtu = rte->rt_mtu;
 413         else
 414                 mtu = ifp->if_mtu;
 415         /* Catch a possible divide by zero later. */
 416         KASSERT(mtu > 0, ("%s: mtu %d <= 0, rte=%p (rt_flags=0x%08x) ifp=%p",
 417             __func__, mtu, rte, (rte != NULL) ? rte->rt_flags : 0, ifp));
 418
 419         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 420                 m->m_flags |= M_MCAST;
 421                 /*
 422                  * IP destination address is multicast.  Make sure "gw"
 423                  * still points to the address in "ro".  (It may have been
 424                  * changed to point to a gateway address, above.)
 425                  */
 426                 gw = dst;
 427                 /*
 428                  * See if the caller provided any multicast options
 429                  */
 430                 if (imo != NULL) {
 431                         ip->ip_ttl = imo->imo_multicast_ttl;
 432                         if (imo->imo_multicast_vif != -1)
 433                                 ip->ip_src.s_addr =
 434                                     ip_mcast_src ?
 435                                     ip_mcast_src(imo->imo_multicast_vif) :
 436                                     INADDR_ANY;
 437                 } else
 438                         ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
 439                 /*
 440                  * Confirm that the outgoing interface supports multicast.
 441                  */
 442                 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
 443                         if ((ifp->if_flags & IFF_MULTICAST) == 0) {
 444                                 IPSTAT_INC(ips_noroute);
 445                                 error = ENETUNREACH;
 446                                 goto bad;
 447                         }
 448                 }
 449                 /*
 450                  * If source address not specified yet, use address
 451                  * of outgoing interface.
 452                  */
 453                 if (ip->ip_src.s_addr == INADDR_ANY) {
 454                         /* Interface may have no addresses. */
 455                         if (ia != NULL)
 456                                 ip->ip_src = IA_SIN(ia)->sin_addr;
 457                 }
 458
 459                 if ((imo == NULL && in_mcast_loop) ||
 460                     (imo && imo->imo_multicast_loop)) {
 461                         /*
 462                          * Loop back multicast datagram if not expressly
 463                          * forbidden to do so, even if we are not a member
 464                          * of the group; ip_input() will filter it later,
 465                          * thus deferring a hash lookup and mutex acquisition
 466                          * at the expense of a cheap copy using m_copym().
 467                          */
 468                         ip_mloopback(ifp, m, hlen);
 469                 } else {
 470                         /*
 471                          * If we are acting as a multicast router, perform
 472                          * multicast forwarding as if the packet had just
 473                          * arrived on the interface to which we are about
 474                          * to send.  The multicast forwarding function
 475                          * recursively calls this function, using the
 476                          * IP_FORWARDING flag to prevent infinite recursion.
 477                          *
 478                          * Multicasts that are looped back by ip_mloopback(),
 479                          * above, will be forwarded by the ip_input() routine,
 480                          * if necessary.
 481                          */
 482                         if (V_ip_mrouter && (flags & IP_FORWARDING) == 0) {
 483                                 /*
 484                                  * If rsvp daemon is not running, do not
 485                                  * set ip_moptions. This ensures that the packet
 486                                  * is multicast and not just sent down one link
 487                                  * as prescribed by rsvpd.
 488                                  */
 489                                 if (!V_rsvp_on)
 490                                         imo = NULL;
 491                                 if (ip_mforward &&
 492                                     ip_mforward(ip, ifp, m, imo) != 0) {
 493                                         m_freem(m);
 494                                         goto done;
 495                                 }
 496                         }
 497                 }
 498
 499                 /*
 500                  * Multicasts with a time-to-live of zero may be looped-
 501                  * back, above, but must not be transmitted on a network.
 502                  * Also, multicasts addressed to the loopback interface
 503                  * are not sent -- the above call to ip_mloopback() will
 504                  * loop back a copy. ip_input() will drop the copy if
 505                  * this host does not belong to the destination group on
 506                  * the loopback interface.
 507                  */
 508                 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) {
 509                         m_freem(m);
 510                         goto done;
 511                 }
 512
 513                 goto sendit;
 514         }
 515
 516         /*
 517          * If the source address is not specified yet, use the address
 518          * of the outoing interface.
 519          */
 520         if (ip->ip_src.s_addr == INADDR_ANY) {
 521                 /* Interface may have no addresses. */
 522                 if (ia != NULL) {
 523                         ip->ip_src = IA_SIN(ia)->sin_addr;
 524                 }
 525         }
 526
 527         /*
 528          * Look for broadcast address and
 529          * verify user is allowed to send
 530          * such a packet.
 531          */
 532         if (isbroadcast) {
 533                 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
 534                         error = EADDRNOTAVAIL;
 535                         goto bad;
 536                 }
 537                 if ((flags & IP_ALLOWBROADCAST) == 0) {
 538                         error = EACCES;
 539                         goto bad;
 540                 }
 541                 /* don't allow broadcast messages to be fragmented */
 542                 if (ip_len > mtu) {
 543                         error = EMSGSIZE;
 544                         goto bad;
 545                 }
 546                 m->m_flags |= M_BCAST;
 547         } else {
 548                 m->m_flags &= ~M_BCAST;
 549         }
 550
 551 sendit:
 552 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 553         if (IPSEC_ENABLED(ipv4)) {
 554                 if ((error = IPSEC_OUTPUT(ipv4, m, inp)) != 0) {
 555                         if (error == EINPROGRESS)
 556                                 error = 0;
 557                         goto done;
 558                 }
 559         }
 560         /*
 561          * Check if there was a route for this packet; return error if not.
 562          */
 563         if (no_route_but_check_spd) {
 564                 IPSTAT_INC(ips_noroute);
 565                 error = EHOSTUNREACH;
 566                 goto bad;
 567         }
 568         /* Update variables that are affected by ipsec4_output(). */
 569         ip = mtod(m, struct ip *);
 570         hlen = ip->ip_hl << 2;
 571 #endif /* IPSEC */
 572
 573         /* Jump over all PFIL processing if hooks are not active. */
 574         if (PFIL_HOOKED(&V_inet_pfil_hook)) {
 575                 switch (ip_output_pfil(&m, ifp, inp, dst, &fibnum, &error)) {
 576                 case 1: /* Finished */
 577                         goto done;
 578
 579                 case 0: /* Continue normally */
 580                         ip = mtod(m, struct ip *);
 581                         break;
 582
 583                 case -1: /* Need to try again */
 584                         /* Reset everything for a new round */
 585                         RO_RTFREE(ro);
 586                         if (have_ia_ref)
 587                                 ifa_free(&ia->ia_ifa);
 588                         ro->ro_prepend = NULL;
 589                         rte = NULL;
 590                         gw = dst;
 591                         ip = mtod(m, struct ip *);
 592                         goto again;
 593
 594                 }
 595         }
 596
 597         /* 127/8 must not appear on wire - RFC1122. */
 598         if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
 599             (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
 600                 if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
 601                         IPSTAT_INC(ips_badaddr);
 602                         error = EADDRNOTAVAIL;
 603                         goto bad;
 604                 }
 605         }
 606
 607         m->m_pkthdr.csum_flags |= CSUM_IP;
 608         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) {
 609                 in_delayed_cksum(m);
 610                 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
 611         }
 612 #ifdef SCTP
 613         if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) {
 614                 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
 615                 m->m_pkthdr.csum_flags &= ~CSUM_SCTP;
 616         }
 617 #endif
 618
 619         /*
 620          * If small enough for interface, or the interface will take
 621          * care of the fragmentation for us, we can just send directly.
 622          */
 623         if (ip_len <= mtu ||
 624             (m->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) {
 625                 ip->ip_sum = 0;
 626                 if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) {
 627                         ip->ip_sum = in_cksum(m, hlen);
 628                         m->m_pkthdr.csum_flags &= ~CSUM_IP;
 629                 }
 630
 631                 /*
 632                  * Record statistics for this interface address.
 633                  * With CSUM_TSO the byte/packet count will be slightly
 634                  * incorrect because we count the IP+TCP headers only
 635                  * once instead of for every generated packet.
 636                  */
 637                 if (!(flags & IP_FORWARDING) && ia) {
 638                         if (m->m_pkthdr.csum_flags & CSUM_TSO)
 639                                 counter_u64_add(ia->ia_ifa.ifa_opackets,
 640                                     m->m_pkthdr.len / m->m_pkthdr.tso_segsz);
 641                         else
 642                                 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
 643
 644                         counter_u64_add(ia->ia_ifa.ifa_obytes, m->m_pkthdr.len);
 645                 }
 646 #ifdef MBUF_STRESS_TEST
 647                 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size)
 648                         m = m_fragment(m, M_NOWAIT, mbuf_frag_size);
 649 #endif
 650                 /*
 651                  * Reset layer specific mbuf flags
 652                  * to avoid confusing lower layers.
 653                  */
 654                 m_clrprotoflags(m);
 655                 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL);
 656                 error = (*ifp->if_output)(ifp, m,
 657                     (const struct sockaddr *)gw, ro);
 658                 goto done;
 659         }
 660
 661         /* Balk when DF bit is set or the interface didn't support TSO. */
 662         if ((ip_off & IP_DF) || (m->m_pkthdr.csum_flags & CSUM_TSO)) {
 663                 error = EMSGSIZE;
 664                 IPSTAT_INC(ips_cantfrag);
 665                 goto bad;
 666         }
 667
 668         /*
 669          * Too large for interface; fragment if possible. If successful,
 670          * on return, m will point to a list of packets to be sent.
 671          */
 672         error = ip_fragment(ip, &m, mtu, ifp->if_hwassist);
 673         if (error)
 674                 goto bad;
 675         for (; m; m = m0) {
 676                 m0 = m->m_nextpkt;
 677                 m->m_nextpkt = 0;
 678                 if (error == 0) {
 679                         /* Record statistics for this interface address. */
 680                         if (ia != NULL) {
 681                                 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
 682                                 counter_u64_add(ia->ia_ifa.ifa_obytes,
 683                                     m->m_pkthdr.len);
 684                         }
 685                         /*
 686                          * Reset layer specific mbuf flags
 687                          * to avoid confusing upper layers.
 688                          */
 689                         m_clrprotoflags(m);
 690
 691                         IP_PROBE(send, NULL, NULL, mtod(m, struct ip *), ifp,
 692                             mtod(m, struct ip *), NULL);
 693                         error = (*ifp->if_output)(ifp, m,
 694                             (const struct sockaddr *)gw, ro);
 695                 } else
 696                         m_freem(m);
 697         }
 698
 699         if (error == 0)
 700                 IPSTAT_INC(ips_fragmented);
 701
 702 done:
 703         /*
 704          * Release the route if using our private route, or if
 705          * (with flowtable) we don't have our own reference.
 706          */
 707         if (ro == &iproute || ro->ro_flags & RT_NORTREF)
 708                 RO_RTFREE(ro);
 709         else if (rte == NULL)
 710                 /*
 711                  * If the caller supplied a route but somehow the reference
 712                  * to it has been released need to prevent the caller
 713                  * calling RTFREE on it again.
 714                  */
 715                 ro->ro_rt = NULL;
 716         if (have_ia_ref)
 717                 ifa_free(&ia->ia_ifa);
 718         return (error);
 719 bad:
 720         m_freem(m);
 721         goto done;
 722 }
 723
 724 /*
 725  * Create a chain of fragments which fit the given mtu. m_frag points to the
 726  * mbuf to be fragmented; on return it points to the chain with the fragments.
 727  * Return 0 if no error. If error, m_frag may contain a partially built
 728  * chain of fragments that should be freed by the caller.
 729  *
 730  * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist)
 731  */
 732 int
 733 ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
 734     u_long if_hwassist_flags)
 735 {
 736         int error = 0;
 737         int hlen = ip->ip_hl << 2;
 738         int len = (mtu - hlen) & ~7;    /* size of payload in each fragment */
 739         int off;
 740         struct mbuf *m0 = *m_frag;      /* the original packet          */
 741         int firstlen;
 742         struct mbuf **mnext;
 743         int nfrags;
 744         uint16_t ip_len, ip_off;
 745
 746         ip_len = ntohs(ip->ip_len);
 747         ip_off = ntohs(ip->ip_off);
 748
 749         if (ip_off & IP_DF) {   /* Fragmentation not allowed */
 750                 IPSTAT_INC(ips_cantfrag);
 751                 return EMSGSIZE;
 752         }
 753
 754         /*
 755          * Must be able to put at least 8 bytes per fragment.
 756          */
 757         if (len < 8)
 758                 return EMSGSIZE;
 759
 760         /*
 761          * If the interface will not calculate checksums on
 762          * fragmented packets, then do it here.
 763          */
 764         if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
 765                 in_delayed_cksum(m0);
 766                 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
 767         }
 768 #ifdef SCTP
 769         if (m0->m_pkthdr.csum_flags & CSUM_SCTP) {
 770                 sctp_delayed_cksum(m0, hlen);
 771                 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP;
 772         }
 773 #endif
 774         if (len > PAGE_SIZE) {
 775                 /*
 776                  * Fragment large datagrams such that each segment
 777                  * contains a multiple of PAGE_SIZE amount of data,
 778                  * plus headers. This enables a receiver to perform
 779                  * page-flipping zero-copy optimizations.
 780                  *
 781                  * XXX When does this help given that sender and receiver
 782                  * could have different page sizes, and also mtu could
 783                  * be less than the receiver's page size ?
 784                  */
 785                 int newlen;
 786
 787                 off = MIN(mtu, m0->m_pkthdr.len);
 788
 789                 /*
 790                  * firstlen (off - hlen) must be aligned on an
 791                  * 8-byte boundary
 792                  */
 793                 if (off < hlen)
 794                         goto smart_frag_failure;
 795                 off = ((off - hlen) & ~7) + hlen;
 796                 newlen = (~PAGE_MASK) & mtu;
 797                 if ((newlen + sizeof (struct ip)) > mtu) {
 798                         /* we failed, go back the default */
 799 smart_frag_failure:
 800                         newlen = len;
 801                         off = hlen + len;
 802                 }
 803                 len = newlen;
 804
 805         } else {
 806                 off = hlen + len;
 807         }
 808
 809         firstlen = off - hlen;
 810         mnext = &m0->m_nextpkt;         /* pointer to next packet */
 811
 812         /*
 813          * Loop through length of segment after first fragment,
 814          * make new header and copy data of each part and link onto chain.
 815          * Here, m0 is the original packet, m is the fragment being created.
 816          * The fragments are linked off the m_nextpkt of the original
 817          * packet, which after processing serves as the first fragment.
 818          */
 819         for (nfrags = 1; off < ip_len; off += len, nfrags++) {
 820                 struct ip *mhip;        /* ip header on the fragment */
 821                 struct mbuf *m;
 822                 int mhlen = sizeof (struct ip);
 823
 824                 m = m_gethdr(M_NOWAIT, MT_DATA);
 825                 if (m == NULL) {
 826                         error = ENOBUFS;
 827                         IPSTAT_INC(ips_odropped);
 828                         goto done;
 829                 }
 830                 /*
 831                  * Make sure the complete packet header gets copied
 832                  * from the originating mbuf to the newly created
 833                  * mbuf. This also ensures that existing firewall
 834                  * classification(s), VLAN tags and so on get copied
 835                  * to the resulting fragmented packet(s):
 836                  */
 837                 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) {
 838                         m_free(m);
 839                         error = ENOBUFS;
 840                         IPSTAT_INC(ips_odropped);
 841                         goto done;
 842                 }
 843                 /*
 844                  * In the first mbuf, leave room for the link header, then
 845                  * copy the original IP header including options. The payload
 846                  * goes into an additional mbuf chain returned by m_copym().
 847                  */
 848                 m->m_data += max_linkhdr;
 849                 mhip = mtod(m, struct ip *);
 850                 *mhip = *ip;
 851                 if (hlen > sizeof (struct ip)) {
 852                         mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
 853                         mhip->ip_v = IPVERSION;
 854                         mhip->ip_hl = mhlen >> 2;
 855                 }
 856                 m->m_len = mhlen;
 857                 /* XXX do we need to add ip_off below ? */
 858                 mhip->ip_off = ((off - hlen) >> 3) + ip_off;
 859                 if (off + len >= ip_len)
 860                         len = ip_len - off;
 861                 else
 862                         mhip->ip_off |= IP_MF;
 863                 mhip->ip_len = htons((u_short)(len + mhlen));
 864                 m->m_next = m_copym(m0, off, len, M_NOWAIT);
 865                 if (m->m_next == NULL) {        /* copy failed */
 866                         m_free(m);
 867                         error = ENOBUFS;        /* ??? */
 868                         IPSTAT_INC(ips_odropped);
 869                         goto done;
 870                 }
 871                 m->m_pkthdr.len = mhlen + len;
 872 #ifdef MAC
 873                 mac_netinet_fragment(m0, m);
 874 #endif
 875                 mhip->ip_off = htons(mhip->ip_off);
 876                 mhip->ip_sum = 0;
 877                 if (m->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
 878                         mhip->ip_sum = in_cksum(m, mhlen);
 879                         m->m_pkthdr.csum_flags &= ~CSUM_IP;
 880                 }
 881                 *mnext = m;
 882                 mnext = &m->m_nextpkt;
 883         }
 884         IPSTAT_ADD(ips_ofragments, nfrags);
 885
 886         /*
 887          * Update first fragment by trimming what's been copied out
 888          * and updating header.
 889          */
 890         m_adj(m0, hlen + firstlen - ip_len);
 891         m0->m_pkthdr.len = hlen + firstlen;
 892         ip->ip_len = htons((u_short)m0->m_pkthdr.len);
 893         ip->ip_off = htons(ip_off | IP_MF);
 894         ip->ip_sum = 0;
 895         if (m0->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
 896                 ip->ip_sum = in_cksum(m0, hlen);
 897                 m0->m_pkthdr.csum_flags &= ~CSUM_IP;
 898         }
 899
 900 done:
 901         *m_frag = m0;
 902         return error;
 903 }
 904
 905 void
 906 in_delayed_cksum(struct mbuf *m)
 907 {
 908         struct ip *ip;
 909         uint16_t csum, offset, ip_len;
 910
 911         ip = mtod(m, struct ip *);
 912         offset = ip->ip_hl << 2 ;
 913         ip_len = ntohs(ip->ip_len);
 914         csum = in_cksum_skip(m, ip_len, offset);
 915         if (m->m_pkthdr.csum_flags & CSUM_UDP && csum == 0)
 916                 csum = 0xffff;
 917         offset += m->m_pkthdr.csum_data;        /* checksum offset */
 918
 919         /* find the mbuf in the chain where the checksum starts*/
 920         while ((m != NULL) && (offset >= m->m_len)) {
 921                 offset -= m->m_len;
 922                 m = m->m_next;
 923         }
 924         KASSERT(m != NULL, ("in_delayed_cksum: checksum outside mbuf chain."));
 925         KASSERT(offset + sizeof(u_short) <= m->m_len, ("in_delayed_cksum: checksum split between mbufs."));
 926         *(u_short *)(m->m_data + offset) = csum;
 927 }
 928
 929 /*
 930  * IP socket option processing.
 931  */
 932 int
 933 ip_ctloutput(struct socket *so, struct sockopt *sopt)
 934 {
 935         struct  inpcb *inp = sotoinpcb(so);
 936         int     error, optval;
 937 #ifdef  RSS
 938         uint32_t rss_bucket;
 939         int retval;
 940 #endif
 941
 942         error = optval = 0;
 943         if (sopt->sopt_level != IPPROTO_IP) {
 944                 error = EINVAL;
 945
 946                 if (sopt->sopt_level == SOL_SOCKET &&
 947                     sopt->sopt_dir == SOPT_SET) {
 948                         switch (sopt->sopt_name) {
 949                         case SO_REUSEADDR:
 950                                 INP_WLOCK(inp);
 951                                 if ((so->so_options & SO_REUSEADDR) != 0)
 952                                         inp->inp_flags2 |= INP_REUSEADDR;
 953                                 else
 954                                         inp->inp_flags2 &= ~INP_REUSEADDR;
 955                                 INP_WUNLOCK(inp);
 956                                 error = 0;
 957                                 break;
 958                         case SO_REUSEPORT:
 959                                 INP_WLOCK(inp);
 960                                 if ((so->so_options & SO_REUSEPORT) != 0)
 961                                         inp->inp_flags2 |= INP_REUSEPORT;
 962                                 else
 963                                         inp->inp_flags2 &= ~INP_REUSEPORT;
 964                                 INP_WUNLOCK(inp);
 965                                 error = 0;
 966                                 break;
 967                         case SO_SETFIB:
 968                                 INP_WLOCK(inp);
 969                                 inp->inp_inc.inc_fibnum = so->so_fibnum;
 970                                 INP_WUNLOCK(inp);
 971                                 error = 0;
 972                                 break;
 973                         default:
 974                                 break;
 975                         }
 976                 }
 977                 return (error);
 978         }
 979
 980         switch (sopt->sopt_dir) {
 981         case SOPT_SET:
 982                 switch (sopt->sopt_name) {
 983                 case IP_OPTIONS:
 984 #ifdef notyet
 985                 case IP_RETOPTS:
 986 #endif
 987                 {
 988                         struct mbuf *m;
 989                         if (sopt->sopt_valsize > MLEN) {
 990                                 error = EMSGSIZE;
 991                                 break;
 992                         }
 993                         m = m_get(sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA);
 994                         if (m == NULL) {
 995                                 error = ENOBUFS;
 996                                 break;
 997                         }
 998                         m->m_len = sopt->sopt_valsize;
 999                         error = sooptcopyin(sopt, mtod(m, char *), m->m_len,
1000                                             m->m_len);
1001                         if (error) {
1002                                 m_free(m);
1003                                 break;
1004                         }
1005                         INP_WLOCK(inp);
1006                         error = ip_pcbopts(inp, sopt->sopt_name, m);
1007                         INP_WUNLOCK(inp);
1008                         return (error);
1009                 }
1010
1011                 case IP_BINDANY:
1012                         if (sopt->sopt_td != NULL) {
1013                                 error = priv_check(sopt->sopt_td,
1014                                     PRIV_NETINET_BINDANY);
1015                                 if (error)
1016                                         break;
1017                         }
1018                         /* FALLTHROUGH */
1019                 case IP_BINDMULTI:
1020 #ifdef  RSS
1021                 case IP_RSS_LISTEN_BUCKET:
1022 #endif
1023                 case IP_TOS:
1024                 case IP_TTL:
1025                 case IP_MINTTL:
1026                 case IP_RECVOPTS:
1027                 case IP_RECVRETOPTS:
1028                 case IP_RECVDSTADDR:
1029                 case IP_RECVTTL:
1030                 case IP_RECVIF:
1031                 case IP_ONESBCAST:
1032                 case IP_DONTFRAG:
1033                 case IP_RECVTOS:
1034                 case IP_RECVFLOWID:
1035 #ifdef  RSS
1036                 case IP_RECVRSSBUCKETID:
1037 #endif
1038                         error = sooptcopyin(sopt, &optval, sizeof optval,
1039                                             sizeof optval);
1040                         if (error)
1041                                 break;
1042
1043                         switch (sopt->sopt_name) {
1044                         case IP_TOS:
1045                                 inp->inp_ip_tos = optval;
1046                                 break;
1047
1048                         case IP_TTL:
1049                                 inp->inp_ip_ttl = optval;
1050                                 break;
1051
1052                         case IP_MINTTL:
1053                                 if (optval >= 0 && optval <= MAXTTL)
1054                                         inp->inp_ip_minttl = optval;
1055                                 else
1056                                         error = EINVAL;
1057                                 break;
1058
1059 #define OPTSET(bit) do {                                                \
1060         INP_WLOCK(inp);                                                 \
1061         if (optval)                                                     \
1062                 inp->inp_flags |= bit;                                  \
1063         else                                                            \
1064                 inp->inp_flags &= ~bit;                                 \
1065         INP_WUNLOCK(inp);                                               \
1066 } while (0)
1067
1068 #define OPTSET2(bit, val) do {                                          \
1069         INP_WLOCK(inp);                                                 \
1070         if (val)                                                        \
1071                 inp->inp_flags2 |= bit;                                 \
1072         else                                                            \
1073                 inp->inp_flags2 &= ~bit;                                \
1074         INP_WUNLOCK(inp);                                               \
1075 } while (0)
1076
1077                         case IP_RECVOPTS:
1078                                 OPTSET(INP_RECVOPTS);
1079                                 break;
1080
1081                         case IP_RECVRETOPTS:
1082                                 OPTSET(INP_RECVRETOPTS);
1083                                 break;
1084
1085                         case IP_RECVDSTADDR:
1086                                 OPTSET(INP_RECVDSTADDR);
1087                                 break;
1088
1089                         case IP_RECVTTL:
1090                                 OPTSET(INP_RECVTTL);
1091                                 break;
1092
1093                         case IP_RECVIF:
1094                                 OPTSET(INP_RECVIF);
1095                                 break;
1096
1097                         case IP_ONESBCAST:
1098                                 OPTSET(INP_ONESBCAST);
1099                                 break;
1100                         case IP_DONTFRAG:
1101                                 OPTSET(INP_DONTFRAG);
1102                                 break;
1103                         case IP_BINDANY:
1104                                 OPTSET(INP_BINDANY);
1105                                 break;
1106                         case IP_RECVTOS:
1107                                 OPTSET(INP_RECVTOS);
1108                                 break;
1109                         case IP_BINDMULTI:
1110                                 OPTSET2(INP_BINDMULTI, optval);
1111                                 break;
1112                         case IP_RECVFLOWID:
1113                                 OPTSET2(INP_RECVFLOWID, optval);
1114                                 break;
1115 #ifdef  RSS
1116                         case IP_RSS_LISTEN_BUCKET:
1117                                 if ((optval >= 0) &&
1118                                     (optval < rss_getnumbuckets())) {
1119                                         inp->inp_rss_listen_bucket = optval;
1120                                         OPTSET2(INP_RSS_BUCKET_SET, 1);
1121                                 } else {
1122                                         error = EINVAL;
1123                                 }
1124                                 break;
1125                         case IP_RECVRSSBUCKETID:
1126                                 OPTSET2(INP_RECVRSSBUCKETID, optval);
1127                                 break;
1128 #endif
1129                         }
1130                         break;
1131 #undef OPTSET
1132 #undef OPTSET2
1133
1134                 /*
1135                  * Multicast socket options are processed by the in_mcast
1136                  * module.
1137                  */
1138                 case IP_MULTICAST_IF:
1139                 case IP_MULTICAST_VIF:
1140                 case IP_MULTICAST_TTL:
1141                 case IP_MULTICAST_LOOP:
1142                 case IP_ADD_MEMBERSHIP:
1143                 case IP_DROP_MEMBERSHIP:
1144                 case IP_ADD_SOURCE_MEMBERSHIP:
1145                 case IP_DROP_SOURCE_MEMBERSHIP:
1146                 case IP_BLOCK_SOURCE:
1147                 case IP_UNBLOCK_SOURCE:
1148                 case IP_MSFILTER:
1149                 case MCAST_JOIN_GROUP:
1150                 case MCAST_LEAVE_GROUP:
1151                 case MCAST_JOIN_SOURCE_GROUP:
1152                 case MCAST_LEAVE_SOURCE_GROUP:
1153                 case MCAST_BLOCK_SOURCE:
1154                 case MCAST_UNBLOCK_SOURCE:
1155                         error = inp_setmoptions(inp, sopt);
1156                         break;
1157
1158                 case IP_PORTRANGE:
1159                         error = sooptcopyin(sopt, &optval, sizeof optval,
1160                                             sizeof optval);
1161                         if (error)
1162                                 break;
1163
1164                         INP_WLOCK(inp);
1165                         switch (optval) {
1166                         case IP_PORTRANGE_DEFAULT:
1167                                 inp->inp_flags &= ~(INP_LOWPORT);
1168                                 inp->inp_flags &= ~(INP_HIGHPORT);
1169                                 break;
1170
1171                         case IP_PORTRANGE_HIGH:
1172                                 inp->inp_flags &= ~(INP_LOWPORT);
1173                                 inp->inp_flags |= INP_HIGHPORT;
1174                                 break;
1175
1176                         case IP_PORTRANGE_LOW:
1177                                 inp->inp_flags &= ~(INP_HIGHPORT);
1178                                 inp->inp_flags |= INP_LOWPORT;
1179                                 break;
1180
1181                         default:
1182                                 error = EINVAL;
1183                                 break;
1184                         }
1185                         INP_WUNLOCK(inp);
1186                         break;
1187
1188 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1189                 case IP_IPSEC_POLICY:
1190                         if (IPSEC_ENABLED(ipv4)) {
1191                                 error = IPSEC_PCBCTL(ipv4, inp, sopt);
1192                                 break;
1193                         }
1194                         /* FALLTHROUGH */
1195 #endif /* IPSEC */
1196
1197                 default:
1198                         error = ENOPROTOOPT;
1199                         break;
1200                 }
1201                 break;
1202
1203         case SOPT_GET:
1204                 switch (sopt->sopt_name) {
1205                 case IP_OPTIONS:
1206                 case IP_RETOPTS:
1207                         if (inp->inp_options)
1208                                 error = sooptcopyout(sopt,
1209                                                      mtod(inp->inp_options,
1210                                                           char *),
1211                                                      inp->inp_options->m_len);
1212                         else
1213                                 sopt->sopt_valsize = 0;
1214                         break;
1215
1216                 case IP_TOS:
1217                 case IP_TTL:
1218                 case IP_MINTTL:
1219                 case IP_RECVOPTS:
1220                 case IP_RECVRETOPTS:
1221                 case IP_RECVDSTADDR:
1222                 case IP_RECVTTL:
1223                 case IP_RECVIF:
1224                 case IP_PORTRANGE:
1225                 case IP_ONESBCAST:
1226                 case IP_DONTFRAG:
1227                 case IP_BINDANY:
1228                 case IP_RECVTOS:
1229                 case IP_BINDMULTI:
1230                 case IP_FLOWID:
1231                 case IP_FLOWTYPE:
1232                 case IP_RECVFLOWID:
1233 #ifdef  RSS
1234                 case IP_RSSBUCKETID:
1235                 case IP_RECVRSSBUCKETID:
1236 #endif
1237                         switch (sopt->sopt_name) {
1238
1239                         case IP_TOS:
1240                                 optval = inp->inp_ip_tos;
1241                                 break;
1242
1243                         case IP_TTL:
1244                                 optval = inp->inp_ip_ttl;
1245                                 break;
1246
1247                         case IP_MINTTL:
1248                                 optval = inp->inp_ip_minttl;
1249                                 break;
1250
1251 #define OPTBIT(bit)     (inp->inp_flags & bit ? 1 : 0)
1252 #define OPTBIT2(bit)    (inp->inp_flags2 & bit ? 1 : 0)
1253
1254                         case IP_RECVOPTS:
1255                                 optval = OPTBIT(INP_RECVOPTS);
1256                                 break;
1257
1258                         case IP_RECVRETOPTS:
1259                                 optval = OPTBIT(INP_RECVRETOPTS);
1260                                 break;
1261
1262                         case IP_RECVDSTADDR:
1263                                 optval = OPTBIT(INP_RECVDSTADDR);
1264                                 break;
1265
1266                         case IP_RECVTTL:
1267                                 optval = OPTBIT(INP_RECVTTL);
1268                                 break;
1269
1270                         case IP_RECVIF:
1271                                 optval = OPTBIT(INP_RECVIF);
1272                                 break;
1273
1274                         case IP_PORTRANGE:
1275                                 if (inp->inp_flags & INP_HIGHPORT)
1276                                         optval = IP_PORTRANGE_HIGH;
1277                                 else if (inp->inp_flags & INP_LOWPORT)
1278                                         optval = IP_PORTRANGE_LOW;
1279                                 else
1280                                         optval = 0;
1281                                 break;
1282
1283                         case IP_ONESBCAST:
1284                                 optval = OPTBIT(INP_ONESBCAST);
1285                                 break;
1286                         case IP_DONTFRAG:
1287                                 optval = OPTBIT(INP_DONTFRAG);
1288                                 break;
1289                         case IP_BINDANY:
1290                                 optval = OPTBIT(INP_BINDANY);
1291                                 break;
1292                         case IP_RECVTOS:
1293                                 optval = OPTBIT(INP_RECVTOS);
1294                                 break;
1295                         case IP_FLOWID:
1296                                 optval = inp->inp_flowid;
1297                                 break;
1298                         case IP_FLOWTYPE:
1299                                 optval = inp->inp_flowtype;
1300                                 break;
1301                         case IP_RECVFLOWID:
1302                                 optval = OPTBIT2(INP_RECVFLOWID);
1303                                 break;
1304 #ifdef  RSS
1305                         case IP_RSSBUCKETID:
1306                                 retval = rss_hash2bucket(inp->inp_flowid,
1307                                     inp->inp_flowtype,
1308                                     &rss_bucket);
1309                                 if (retval == 0)
1310                                         optval = rss_bucket;
1311                                 else
1312                                         error = EINVAL;
1313                                 break;
1314                         case IP_RECVRSSBUCKETID:
1315                                 optval = OPTBIT2(INP_RECVRSSBUCKETID);
1316                                 break;
1317 #endif
1318                         case IP_BINDMULTI:
1319                                 optval = OPTBIT2(INP_BINDMULTI);
1320                                 break;
1321                         }
1322                         error = sooptcopyout(sopt, &optval, sizeof optval);
1323                         break;
1324
1325                 /*
1326                  * Multicast socket options are processed by the in_mcast
1327                  * module.
1328                  */
1329                 case IP_MULTICAST_IF:
1330                 case IP_MULTICAST_VIF:
1331                 case IP_MULTICAST_TTL:
1332                 case IP_MULTICAST_LOOP:
1333                 case IP_MSFILTER:
1334                         error = inp_getmoptions(inp, sopt);
1335                         break;
1336
1337 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1338                 case IP_IPSEC_POLICY:
1339                         if (IPSEC_ENABLED(ipv4)) {
1340                                 error = IPSEC_PCBCTL(ipv4, inp, sopt);
1341                                 break;
1342                         }
1343                         /* FALLTHROUGH */
1344 #endif /* IPSEC */
1345
1346                 default:
1347                         error = ENOPROTOOPT;
1348                         break;
1349                 }
1350                 break;
1351         }
1352         return (error);
1353 }
1354
1355 /*
1356  * Routine called from ip_output() to loop back a copy of an IP multicast
1357  * packet to the input queue of a specified interface.  Note that this
1358  * calls the output routine of the loopback "driver", but with an interface
1359  * pointer that might NOT be a loopback interface -- evil, but easier than
1360  * replicating that code here.
1361  */
1362 static void
1363 ip_mloopback(struct ifnet *ifp, const struct mbuf *m, int hlen)
1364 {
1365         struct ip *ip;
1366         struct mbuf *copym;
1367
1368         /*
1369          * Make a deep copy of the packet because we're going to
1370          * modify the pack in order to generate checksums.
1371          */
1372         copym = m_dup(m, M_NOWAIT);
1373         if (copym != NULL && (!M_WRITABLE(copym) || copym->m_len < hlen))
1374                 copym = m_pullup(copym, hlen);
1375         if (copym != NULL) {
1376                 /* If needed, compute the checksum and mark it as valid. */
1377                 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
1378                         in_delayed_cksum(copym);
1379                         copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
1380                         copym->m_pkthdr.csum_flags |=
1381                             CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
1382                         copym->m_pkthdr.csum_data = 0xffff;
1383                 }
1384                 /*
1385                  * We don't bother to fragment if the IP length is greater
1386                  * than the interface's MTU.  Can this possibly matter?
1387                  */
1388                 ip = mtod(copym, struct ip *);
1389                 ip->ip_sum = 0;
1390                 ip->ip_sum = in_cksum(copym, hlen);
1391                 if_simloop(ifp, copym, AF_INET, 0);
1392         }
1393 }